2009/12/12 Henrik Rudstrom <hrudst...@googlemail.com> > Hi all, > Been taking a few looks at the sgeom module, trying to find some > documentation on its purpose, but there's little docs to be found. > Looking at the methods/operations it seems to have some overlap with the > rest of opencascade, and it also seems to be geared towards interactive > application development ??? > Could anyone perhaps shed some light on Salome geom, and especially its > role within the python-occ? In what cases is it to be used? as an > abstraction layer for the whole occ or just for specific > functionalities/contexts? What is the relation between the OCC types vs > SGEOM types? > > Thanks in advance > > Henrik Rudstrom > > Hi Henrik,
Our initial purpose, with Jelle, was to add parametric modeling features to pythonOCC. OCC 6.3.0 provides a mechanism (topological naming) making it possible. This is however quite hard to understand and implement. The Salomé project already offers a parametric modeling module, named GEOM, that is based upon OCC 6.3.0 topological naming. This module was extracted from Salomé and released as a standalone package by Fotis ( http://sf.net/projects/salomegeometry). When we started to work on parametric modeling with Jelle, we had three choices: - implement something completely new from scratch, - port the C++ salomegeometry code to pythonOCC, - wrap to python the C++ salomegeometry library. We decided to choose the third solution (the quickest way to have something running, easier to maintain). The wrapper to SalomeGeometry is composed of the following additional python modules: Archimede, SGEOM, GEOM_Algo, GEOM_Impl, BlockFix, NMTDS, NMTools, Partition, ShHealOper, Sketecher. Each of this python module is deeply integrated to pythonOCC (for instance, the SGEOM modules depend on TDocStd, MMgt, TCollection, TFunction and Standard). You can use all the OCC algorithms over a TopoDS_Shape generated with a GEOM_algo object. To simplify the access to all the objects/methods, Jelle and I developped a package named 'Parametric Application Framework' (PAF), that is intended to abstract the salomegeometry internals, and make something more pythonic. The PAF still need to be improved. Regards, Thomas
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